1UpKeyboards Pi60 Layout Additions (#21874)
* [refactor] rename LAYOUT_60_ansi to LAYOUT_all
* [enhancement] add LAYOUT_60_ansi
* [enhancement] add LAYOUT_60_ansi_split_bs_rshift
* [enhancement] add LAYOUT_60_ansi_tsangan
* [enhancement] add LAYOUT_60_tsangan_hhkb
* [enhancement] add LAYOUT_60_iso
* [enhancement] add LAYOUT_60_iso_split_bs_rshift
* [enhancement] add LAYOUT_60_iso_tsangan
* [enhancement] add LAYOUT_60_iso_tsangan_split_bs_rshift
* [enhancement] enable Community Layout support
* [enhancement] add LAYOUT_60_hhkb
* [enhancement] add LAYOUT_60_ansi_arrow
* [enhancement] add LAYOUT_60_iso_arrow
* [docs] add layout/matrix diagram
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